Sierra-class submarine

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The Sierra class (Soviet Project 945 Barrakuda and Project 945A Kondor; NATO reporting names Sierra I and Sierra II) are a series of nuclear-powered attack submarines built for the Soviet Navy and currently in service with the Russian Navy. The Sierra II boats are the only titanium-hulled submarines currently commissioned in the Russian Navy. The Sierra class was a third generation Soviet attack submarine. It resembles the Alfa-class submarine in having a light and strong titanium pressure hull which enables the submarines of the class to dive to greater depths, reduce the level of radiated noise and increase resistance to torpedo attacks. It is powered by a single OK-650 pressurized water reactor. Due to the difficulties of working with titanium, and later also the fall of the Soviet Union, only two boats each of the Sierra I and Sierra II variants were made. The Akula-class submarine was created as an alternative to the Sierra class, being very similar but made of steel, and became much...

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